This presentation provides an in-depth analysis of scheduling lead and lag. It has definitions, examples and various diagrammatic representations. It also shows how these can be used with 4 types of scheduling relationships - FS, FF, SS, SF

1. LEAD & LAG
DEFINITIONS, EXAMPLES AND
DIAGRAMS
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2. AGENDA
• Definitions, Examples & Diagrammatic Representations
• Lead with 4 Types of Scheduling Relationships
• Lag with 4 Types of Scheduling Relationships
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3. LEAD
• The amount of time whereby a successor activity can be
advanced with respect to a predecessor activity.
• Example
• In an Engineering Project, collection of requirement can LEAD creation of
design.
• In a Construction Project, interior finishing of a room will follow
plastering of walls.
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4. REPRESENTATION OF LEAD
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B(S) = A(F) – 1d
Example
Duration of A = 3 Days, Duration of B = 2 Days, Duration of Lead = n Days (nD)
The scheduled Start(S) of B is 1 day before (-1d) the scheduled Finish(F) of B
Mathematical
Network Diagram
A B-nD
FS-nD
A B
Bar Chart

5. LAG
• The amount of time whereby a successor activity is required to
be delayed with respect to a predecessor activity.
• Example
• A – Lay ceiling for Floor I, B – Construct Columns for Floor II.
• A – Ship goods to a customer, B – Check if shipment has been delivered.
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6. REPRESENTATION OF LAG
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B(S) = A(F) + 1d
Example
Duration of A = 3 Days, Duration of B = 2 Days, Duration of Lag = n Days (nD)
The scheduled Start(S) of B is 1 day after (+1d) the scheduled Finish(F) of A
Mathematical
Network Diagram
A B
+nD
FS+nD
A B
Bar Chart

7. AGENDA
• Definitions, Examples & Diagrammatic Representations
• Lead with 4 Types of Scheduling Relationships
• Lag with 4 Types of Scheduling Relationships
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8. LEAD AND FINISH TO START
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Duration of A = 3 Days
Duration of B = 2 Days
B has a Finish to Start Relationship with A
The scheduled Start of B is 1 day before the
scheduled Finish of A
A B
A B
FS-1d
-1d
-1d
Network Diagram Bar Chart
Example

9. LEAD AND FINISH TO FINISH
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Duration of A = 3 Days
Duration of B = 2 Days
B has a Finish to Finish Relationship with A
The scheduled Finish of B is 1 day before the
scheduled Finish of A
A B
A B
FF-1d
-1d
-1d
Network Diagram Bar Chart
Example
-1d

10. LEAD AND START TO START
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Duration of A = 3 Days
Duration of B = 2 Days
B has a Start to Start Relationship with A
The scheduled Start of B is 1 day before the
scheduled Start of A
A B
A B
SS-1d
-1d
Network Diagram Bar Chart
Example
-1d

11. LEAD AND START TO FINISH
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Duration of A = 3 Days
Duration of B = 2 Days
B has a Start to Finish Relationship with A
The scheduled Finish of B is 1 day before the
scheduled Start of A
A B
A BSF-1d
-1d
Network Diagram Bar Chart
Example
-1d

12. AGENDA
• Definitions, Examples & Diagrammatic Representations
• Lead with 4 Types of Scheduling Relationships
• Lag with 4 Types of Scheduling Relationships
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13. LAG AND FINISH TO START
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Duration of A = 3 Days
Duration of B = 2 Days
B has a Finish to Start Relationship with A
The scheduled Start of B is 1 day after the scheduled
Finish of A
A B
A B
FS+1d
+1d
Network Diagram Bar Chart
Example
+1d

14. LAG AND FINISH TO FINISH
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Duration of A = 3 Days
Duration of B = 2 Days
B has a Finish to Finish Relationship with A
The scheduled Finish of B is 1 day after the scheduled
Finish of A
A B
A B
FF+1d
+1d
Network Diagram Bar Chart
Example
+1d

15. LAG AND START TO START
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Duration of A = 3 Days
Duration of B = 2 Days
B has a Start to Start Relationship with A
The scheduled Start of B is 1 day after the scheduled
Start of A
A B
A B
SS+1d
+1d
Network Diagram Bar Chart
Example
+1d

16. LAG AND START TO FINISH
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Duration of A = 3 Days
Duration of B = 2 Days
B has a Start to Finish Relationship with A
The scheduled Finish of B is 1 day after the scheduled
Start of A
A B
A B
SF+1d
+1d
Network Diagram Bar Chart
Example
+1d

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